CN210103473U - Urea pyrolysis reactor capable of preventing tail crystallization - Google Patents
Urea pyrolysis reactor capable of preventing tail crystallization Download PDFInfo
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- CN210103473U CN210103473U CN201920788207.8U CN201920788207U CN210103473U CN 210103473 U CN210103473 U CN 210103473U CN 201920788207 U CN201920788207 U CN 201920788207U CN 210103473 U CN210103473 U CN 210103473U
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- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/08—Preparation of ammonia from nitrogenous organic substances
- C01C1/086—Preparation of ammonia from nitrogenous organic substances from urea
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Abstract
The utility model provides a prevent urea pyrolysis reactor of afterbody crystallization, including the reactor import section that sets gradually, reactor body and reactor export section, be equipped with a reducing section between reactor import section and the reactor body, reactor body upper portion is from last to having set gradually fairing and tube nest extremely down, the urea solution spray gun stretches into the reactor body from the outside inside, and the urea solution spray gun sets up the below at the tube nest, dilute the wind pipe connection and have two dilution air branch pipes, two dilution air branch pipes insert reactor body lower part respectively, dilution air branch pipe is close to reactor body department and all is equipped with demineralized water nozzle and branch road valve. The utility model discloses a set up fairing, tube grating and dilute the evenly distributed that wind branch pipe increased dilution wind speed field and temperature field on the pyrolytic reaction ware cross-section, improve the reaction temperature of reactor lower part, be favorable to the complete decomposition of urea, avoid producing the crystallization at the afterbody because of reaction temperature is not enough.
Description
Technical Field
The utility model belongs to the technical field of the urea pyrolytic reaction and specifically relates to a prevent urea pyrolytic reaction ware of afterbody crystallization.
Background
The decomposition of urea is mainly carried out in a pyrolysis reactor, which is a container with a full interior, hot air enters from an inlet section, and urea is injected into the hot air for reaction through an injector providing full distribution. At present, the urea pyrolysis technology is successfully applied to denitration systems of dozens of domestic generator sets. In practice, however, crystallization becomes a problem for almost every set of pyrolysis apparatus. For example, due to the fact that serious crystals appear in the urea pyrolysis device of the Shanxi power plant, a large amount of crystals are attached to the inner wall of the pyrolysis chamber, normal operation of the whole pyrolysis system is seriously influenced, on one hand, hot air cannot flow uniformly in the pyrolysis chamber, distribution of temperature is hindered, and the pyrolysis chamber cannot reach the temperature condition required by urea decomposition; on the other hand, a large amount of crystals occupy the space in the pyrolysis chamber, so that the urea solution is attached to crystals before being completely decomposed to form a new crystal layer, and the urea solution cannot be decomposed continuously. Under vicious cycles, the entire pyrolysis chamber may become completely blocked, causing serious accidents.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem provide a prevent urea pyrolytic reaction ware of afterbody crystallization through setting up fairing, tube grid and the evenly distributed that dilutes wind speed field and temperature field on the dilution air branch pipe increase pyrolytic reaction ware cross-section, improves the reaction temperature of reactor lower part, is favorable to the complete decomposition of urea, avoids producing the crystallization at the afterbody because of reaction temperature is not enough.
Realize the utility model discloses the technical solution of purpose does:
a urea pyrolysis reactor for preventing tail crystallization comprises a reactor inlet section, a reactor body and a reactor outlet section, wherein the reactor inlet section and the reactor outlet section are respectively arranged at the top end and the bottom end of the reactor body; one end of the reactor inlet section, which is far away from the reactor body, is connected with a dilution air pipeline, a reducer section is arranged between the reactor inlet section and the reactor body, and the diameter of the joint of the reducer section and the reactor inlet section is smaller than that of the joint of the reducer section and the reactor body; the upper part of the reactor body is sequentially provided with a rectifying device and a tube grid from top to bottom, and the rectifying device is tightly connected with the tube grid; the urea solution spray guns extend into the reactor body from the outside and are arranged below the pipe grids; dilution wind pipe connection has two and dilutes the wind branch pipe, and two and dilute the wind branch pipe and insert reactor body lower part respectively, and have the difference in height between two and dilute the wind branch pipes, dilute the wind branch pipe and all be equipped with demineralized water nozzle and branch road valve near reactor body department, and the branch road valve is located between demineralized water nozzle and the reactor body.
Further, the utility model discloses a prevent urea pyrolytic reaction ware of afterbody crystallization, fairing comprises a plurality of lines of high temperature resistant steel sheet fairings, wherein, the odd number line of high temperature resistant steel sheet fairing is opposite with the even number line of high temperature resistant steel sheet fairing opposite direction, the high temperature resistant steel sheet fairing quantity of every direction is n, every high temperature resistant steel sheet fairing is theta with horizontal direction's acute angle contained angle, horizontal distance between the adjacent high temperature resistant steel sheet fairing in the same line is L, the width of every high temperature resistant steel sheet fairing is m, fairing's total height is H.
Further, the utility model discloses a prevent urea pyrolysis reactor of afterbody crystallization, the width m of high temperature resistant steel sheet fairing and the diameter ratio value of reactor body are 1/6 ~ 1/10, and high temperature resistant steel sheet fairing is 45 ~ 60 with horizontal direction contained angle theta, and horizontal distance L between the adjacent high temperature resistant steel sheet fairing is 60mm ~ 150mm, and fairing's high H is 200mm ~ 500 mm.
Further, the utility model discloses a prevent urea pyrolysis reactor of afterbody crystallization, tube grid include two horizontal rows about dislocation arrangement's pipe.
Further, the utility model discloses a prevent urea pyrolysis reactor of afterbody crystallization, two dilution wind branch pipes all insert the reactor body between the reactor body apart from bottom 1/3 department to reactor body bottom internally.
Further, the utility model discloses a prevent urea pyrolysis reactor of afterbody crystallization, reducing section, fairing, pipe bars are the concentric setting, and the axis direction of reactor body is followed to its central line.
Further, the utility model discloses a prevent urea pyrolysis reactor of afterbody crystallization, fairing, tube grid link to each other with the inner wall of reactor body at least part.
Further, the utility model discloses a prevent urea pyrolysis reactor of afterbody crystallization, this internal pressure detector that still is provided with of reactor, pressure detector is connected with the branch road valve.
Further, the utility model discloses a prevent urea pyrolysis reactor of afterbody crystallization, two dilution air branch pipes insert at the bilateral symmetry of reactor body.
The utility model adopts the above technical scheme to compare with prior art, have following technological effect:
1. the utility model discloses a urea pyrolysis reactor for preventing tail crystallization, through setting up fairing and tube grating in the upper portion, effectively increase the even distribution of dilution wind velocity field and temperature field on the pyrolysis reactor cross-section, be favorable to the complete decomposition of urea;
2. the utility model discloses a prevent urea pyrolysis reactor of afterbody crystallization through set up dilution wind branch pipe and insert the reactor lower part, directly introduce the reactor lower part with dilution wind, improve pyrolysis reactor's lower part reaction temperature, improve the decomposition of urea, effectively avoid producing the crystallization at the afterbody because of reaction temperature is insufficient;
3. the utility model discloses a prevent urea pyrolytic reaction ware of afterbody crystallization through upper portion rectification and lower part improvement reaction temperature, has improved pyrolytic reaction efficiency, has guaranteed urea pyrolytic reaction ware's reliability.
Drawings
FIG. 1 is a schematic diagram of a urea pyrolysis reactor for preventing tail crystallization according to the present invention;
FIG. 2 is a schematic view of a rectification apparatus of a urea pyrolysis reactor for preventing tail crystallization according to the present invention;
FIG. 3 is a schematic cross-sectional view of a rectifying device A-A of the urea pyrolysis reactor for preventing tail crystallization according to the present invention;
FIG. 4 is a schematic cross-sectional view of a rectification apparatus B-B of a urea pyrolysis reactor for preventing tail crystallization according to the present invention;
fig. 5 is a schematic structural diagram of a tube grid of the urea pyrolysis reactor for preventing tail crystallization according to the present invention.
Reference signs mean: 1: reactor body, 2: reactor inlet section, 3: diameter-changing section, 4: rectifying device, 5: tube grid, 6: urea solution spray gun, 7: dilution air branch pipe, 8: demineralized water nozzle, 9: bypass valve, 10: reactor outlet section, 11: dilution air duct, 12: high temperature resistant steel plate fairing.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
A urea pyrolysis reactor for preventing tail crystallization comprises a reactor inlet section 2, a reactor body 1 and a reactor outlet section 10, wherein the reactor inlet section 2 and the reactor outlet section 10 are respectively arranged at the top end and the bottom end of the reactor body 1; one end of the reactor inlet section 2, which is far away from the reactor body 1, is connected with a dilution air pipeline 11, a reducer section 3 is arranged between the reactor inlet section 2 and the reactor body 1, and the diameter of the joint of the reducer section 3 and the reactor inlet section 2 is smaller than that of the joint of the reducer section 3 and the reactor body 1;
the upper part of the reactor body 1 is sequentially provided with a rectifying device 4 and a tube grid 5 from top to bottom, and the rectifying device 4 is tightly connected with the tube grid 5; a plurality of urea solution spray guns 6 extend into the reactor body 1 from the outside, and the urea solution spray guns 6 are arranged below the pipe grid 5; dilution air duct 11 is connected with two and dilutes wind branch pipe 7, and two and dilutes wind branch pipe 7 and insert the 1 lower part of reactor body respectively, and has the difference in height between two and dilutes wind branch pipe 7, dilutes wind branch pipe 7 and all is equipped with demineralized water nozzle 8 and branch road valve 9 near reactor body 1 department, and branch road valve 9 is located between demineralized water nozzle 8 and reactor body 1.
Example 1
A urea pyrolysis reactor for preventing tail crystallization is shown in figure 1 and comprises a reactor inlet section 2, a reactor body 1 and a reactor outlet section 10, wherein the reactor inlet section 2 and the reactor outlet section 10 are respectively arranged at the top end and the bottom end of the reactor body 1.
The one end that reactor inlet section 2 kept away from reactor body 1 is connected dilution wind pipeline 11, is equipped with a reducing section 3 between reactor inlet section 2 and the reactor body 1, the diameter of reducing section 3 and reactor inlet section 2 junction is less than the diameter of reducing section 3 and reactor body 1 junction.
The upper part of the reactor body 1 is sequentially provided with a rectifying device 4 and a tube grid 5 from top to bottom, and the rectifying device 4 is tightly connected with the tube grid 5. As shown in fig. 2, 3, and 4, the rectifying device 4 is composed of a plurality of rows of high temperature resistant steel plate rectifying pieces 12, wherein the directions of the odd-numbered rows of high temperature resistant steel plate rectifying pieces 12 are opposite to the directions of the even-numbered rows of high temperature resistant steel plate rectifying pieces 12, the number of the high temperature resistant steel plate rectifying pieces 12 in each direction is n, the acute angle included angle between each high temperature resistant steel plate rectifying piece 12 and the horizontal direction is theta, and the theta is 45-60 degrees; the horizontal distance between adjacent high-temperature resistant steel plate rectifying pieces 12 in the same row is L, and L is 60 mm-150 mm; each high-temperature-resistant steel plate rectifying piece 12 is m in width, and the ratio of the width m to the diameter of the reactor body 1 is 1/6-1/10; the total height of the rectifying device 4 is H, and H is 200 mm-500 mm. As shown in fig. 5, the tube grid 5 includes two horizontal rows of round tubes which are arranged in a staggered manner. Meanwhile, the reducing section 3, the rectifying device 4 and the pipe grid 5 are concentrically arranged, and the central line of the reducing section is along the axial direction of the reactor body 1. The rectifying device 4 and the tube grid 5 are at least partially connected with the inner wall of the reactor body 1.
A plurality of urea solution spray guns 6 stretch into the reactor body 1 from the outside, and the urea solution spray guns 6 are arranged below the pipe grid 5.
Dilution air duct 11 is connected with two and dilutes wind branch pipe 7, and two and dilutes wind branch pipe 7 and all insert reactor body 1 between reactor body 1 apart from bottom 1/3 department to reactor body 1 bottom, and two and dilute wind branch pipe 7 and have the difference in height at the bilateral symmetry of reactor body 1's access, two and dilute between the wind branch pipe 7. The diluting air branch pipes 7 are provided with desalted water nozzles 8 and branch valves 9 at positions close to the reactor body 1, and the branch valves 9 are positioned between the desalted water nozzles 8 and the reactor body 1.
The reactor body 1 is also internally provided with a pressure detector which is connected with the branch valve 9.
The urea pyrolysis reactor for preventing tail crystallization can increase the uniform distribution of a dilution air speed field and a temperature field on the cross section of the pyrolysis reactor through the rectifying device and the pipe grid on the upper part, and is favorable for the complete decomposition of urea; and meanwhile, dilution air branch pipes are arranged on the dilution air pipeline and respectively connected to the lower parts of the urea pyrolysis reactors, and dilution air is directly introduced into the lower parts of the reactors, so that the reaction temperature of the lower parts of the pyrolysis reactors is increased, the decomposition of urea at the lower parts of the urea pyrolysis reactors is increased, and the phenomenon that crystallization is generated at the tail parts due to insufficient reaction temperature is effectively avoided. In summary, the reliability of the urea pyrolysis reactor is improved to a great extent by the rectification in the upper part and the increase in the reaction temperature in the lower part.
The foregoing is only a part of the embodiments of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements can be made without departing from the principles of the present invention, and these improvements should be regarded as the protection scope of the present invention.
Claims (9)
1. The urea pyrolysis reactor for preventing tail crystallization is characterized by comprising a reactor inlet section (2), a reactor body (1) and a reactor outlet section (10), wherein the reactor inlet section (2) and the reactor outlet section (10) are respectively arranged at the top end and the bottom end of the reactor body (1); one end, far away from the reactor body (1), of the reactor inlet section (2) is connected with a dilution air pipeline (11), a reducing section (3) is arranged between the reactor inlet section (2) and the reactor body (1), and the diameter of the joint of the reducing section (3) and the reactor inlet section (2) is smaller than that of the joint of the reducing section (3) and the reactor body (1);
the upper part of the reactor body (1) is sequentially provided with a rectifying device (4) and a tube grid (5) from top to bottom, and the rectifying device (4) is tightly connected with the tube grid (5); the urea solution spray guns (6) extend into the reactor body (1) from the outside, and the urea solution spray guns (6) are arranged below the pipe grid (5); dilute wind pipeline (11) and be connected with two and dilute wind branch pipe (7), two and dilute wind branch pipe (7) and insert reactor body (1) lower part respectively, and have the difference in height between two and dilute wind branch pipe (7), dilute wind branch pipe (7) and all be equipped with demineralized water nozzle (8) and branch road valve (9) near reactor body (1) department, and branch road valve (9) are located between demineralized water nozzle (8) and reactor body (1).
2. The urea pyrolysis reactor for preventing tail crystallization according to claim 1, wherein the rectifying device (4) is composed of a plurality of rows of high temperature resistant steel plate rectifying pieces (12), wherein the directions of the odd-numbered rows of high temperature resistant steel plate rectifying pieces (12) are opposite to the directions of the even-numbered rows of high temperature resistant steel plate rectifying pieces (12), the number of the high temperature resistant steel plate rectifying pieces (12) in each direction is n, the acute angle between each high temperature resistant steel plate rectifying piece (12) and the horizontal direction is θ, the horizontal distance between adjacent high temperature resistant steel plate rectifying pieces (12) in the same row is L, the width of each high temperature resistant steel plate rectifying piece (12) is m, and the total height of the rectifying device (4) is H.
3. The urea pyrolysis reactor for preventing tail crystallization according to claim 2, wherein the ratio of the width m of the high temperature resistant steel plate rectifying pieces (12) to the diameter of the reactor body (1) is 1/6-1/10, the included angle θ between the high temperature resistant steel plate rectifying pieces (12) and the horizontal direction is 45-60 °, the horizontal distance L between adjacent high temperature resistant steel plate rectifying pieces (12) is 60-150 mm, and the height H of the rectifying device (4) is 200-500 mm.
4. Urea pyrolysis reactor according to claim 1, characterized in that the grid (5) comprises two rows of tubes arranged offset above each other.
5. Urea pyrolysis reactor according to claim 1, characterized in that two dilution air branch pipes (7) each open into the reactor body (1) between the reactor body (1) from the bottom 1/3 to the bottom of the reactor body (1).
6. Urea pyrolysis reactor according to claim 1, characterized in that the reducer section (3), the fairing (4), the tube grid (5) are concentrically arranged with their centre line along the axial direction of the reactor body (1).
7. Urea pyrolysis reactor according to claim 1, characterized in that the flow straightener (4), the tube grid (5) are at least partly connected to the inner wall of the reactor body (1).
8. Urea pyrolysis reactor according to claim 1, characterized in that a pressure detector is arranged in the reactor body (1) and connected to the by-pass valve (9).
9. Urea pyrolysis reactor according to claim 1, characterized in that two dilution air manifolds (7) are symmetrically incorporated on both sides of the reactor body (1).
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| CN2019207821214 | 2019-05-28 | ||
| CN201920782121 | 2019-05-28 |
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| CN201910455329.XA Pending CN110127723A (en) | 2019-05-28 | 2019-05-29 | A kind of urea pyrolysis reactor for preventing tail portion from crystallizing |
| CN201920788207.8U Active CN210103473U (en) | 2019-05-28 | 2019-05-29 | Urea pyrolysis reactor capable of preventing tail crystallization |
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| MY158670A (en) * | 2008-05-27 | 2016-10-31 | Fuel Tech Inc | Selective catalytic nox reduction process and apparatus providing improved gasification of urea to form ammonia-containing gas |
| CN105366691B (en) * | 2015-11-25 | 2017-06-27 | 东方电气集团东方锅炉股份有限公司 | The large-scale urea pyrolysis reactor of low design and operation risk and urea crystals risk |
| CN205500799U (en) * | 2016-03-04 | 2016-08-24 | 上海电气电站环保工程有限公司 | Urea pyrolysis device |
| CN105854551A (en) * | 2016-05-19 | 2016-08-17 | 大唐环境产业集团股份有限公司 | Double-alkali double-circulation desulfurization absorption system and method |
| CN106082271B (en) * | 2016-06-01 | 2018-07-03 | 福建龙净环保股份有限公司 | Suitable for the urea back-mixing pyrolysis installation and method for pyrolysis of SCR denitration system |
| CN206184287U (en) * | 2016-11-11 | 2017-05-24 | 山东星耀环境能源有限公司 | Board -like blender |
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Effective date of registration: 20220713 Address after: 211100 room 417, floor 4, building 1-1, No. 19, Changqing street, moling street, Jiangning District, Nanjing, Jiangsu Province Patentee after: Nanjing Kaicheng Environmental Protection Technology Co.,Ltd. Address before: 210000 floor 4, building 1-1, No. 19, Changqing street, Jiangning District, Nanjing, Jiangsu Province Patentee before: NANJING JIEKEFENG ENVIRONMENTAL PROTECTION TECHNOLOGY EQUIPMENT RESEARCH INSTITUTE Co.,Ltd. |